MarketPR
Solaris Energy Infrastructure Inc. (NYSE: SEI) will join the S&P SmallCap 600 before the opening bell on Wednesday, July 15, 2026, replacing Catalyst Pharmaceuticals Inc. The slot opens because Angelini Pharma S.p.A.
is acquiring Catalyst, which disqualifies the pharma company from index membership once the transaction closes.
S&P Global announced the reconstitution on July 9, leaving less than a week for the market to price in the mechanics before the effective date.
The mechanics behind the slot This is not a discretionary selection based on Solaris's financials. Catalyst Pharmaceuticals exits the index because an acquisition by Angelini Pharma S.p.A.
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